Hoppscotch
Open-source API development and testing platform. Hoppscotch is a web-based alternative to Postman — make HTTP requests, test REST/GraphQL/WebSocket/MQTT/SSE endpoints, organize collections, and write tests. Runs entirely in the browser (no install needed) or as a self-hosted platform. Supports real-time protocols (WebSocket, SSE, MQTT) better than Postman. Open-source MIT with a commercial Hoppscotch Enterprise for team features.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
MIT open source for auditability. Self-host option for full security control. Cloud version: requests proxied through browser (no server-side logging of request bodies). Sensitive credentials in test environments must be managed via Hoppscotch environments.
⚡ Reliability
Best When
You need a free, open-source API client for development and testing that supports real-time protocols (WebSocket, SSE) and can be self-hosted for security.
Avoid When
You're already on Postman with large shared workspaces — migration cost is high. Avoid for automated CI testing pipelines — use dedicated API testing tools.
Use Cases
- • Test REST, GraphQL, WebSocket, SSE, and MQTT agent endpoints in a browser-based API client without installation
- • Create and share API collections for agent API documentation with team workspaces in Hoppscotch Cloud
- • Write automated API tests using Hoppscotch's test scripts (JavaScript) for pre/post-request validation
- • Self-host Hoppscotch for secure internal API testing where Postman cloud sync is not acceptable for sensitive endpoints
- • Debug WebSocket and SSE connections for agent streaming endpoints with Hoppscotch's real-time protocol support
Not For
- • Complex API automation pipelines — use Newman (Postman CLI), K6, or Pytest for programmatic API testing pipelines
- • Teams deeply invested in Postman — Hoppscotch's collection format is not Postman-compatible; migration requires conversion
- • API performance testing — Hoppscotch is for development/debugging, not load testing
Interface
Authentication
Hoppscotch Cloud uses Google/GitHub OAuth for login. Enterprise adds SSO/SAML. The API client itself supports all authentication methods for testing: API keys, OAuth, Bearer, Basic, etc. — as an HTTP client.
Pricing
Core Hoppscotch is MIT open source. Cloud (hoppscotch.io) is free for personal use. Enterprise adds team management, SSO, and self-hosted support. Most teams use either the free cloud or self-host.
Agent Metadata
Known Gotchas
- ⚠ Hoppscotch's collection format is proprietary JSON — not compatible with Postman collections or OpenAPI without conversion tools
- ⚠ Hoppscotch Cloud sync requires account login — local-only mode with no sync is available via the self-hosted desktop app or browser offline
- ⚠ Test scripts use a subset of JavaScript with Hoppscotch's pw object — not compatible with Postman's pm object; tests need rewriting when migrating
- ⚠ WebSocket testing in Hoppscotch connects to a single endpoint — does not support complex multi-connection scenarios needed for distributed agent testing
- ⚠ Import from OpenAPI/Swagger creates basic requests but doesn't auto-generate test scripts or environment variables — still requires manual test authoring
- ⚠ Hoppscotch Enterprise self-hosted requires Docker Compose setup with PostgreSQL and Redis — more operational overhead than the cloud version
Alternatives
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Scores are editorial opinions as of 2026-03-07.